Modelling intra-annual dynamics of a major marine-terminating Arctic glacier
Significant intra-annual variability in flow rates of tidewater-terminating Arctic glaciers has been observed in recent years. These changes may result from oceanic and/or atmospheric forcing through (1) perturbations at the terminus, such as enhanced submarine melt and changes in sea-ice buttressin...
Published in: | Annals of Glaciology |
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Annals of Glaciology
2017
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Online Access: | https://arcabc.ca/islandora/object/twu%3A430 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/9BA9EFDDF0BD74B9C848B2446094399D/S0260305517000234a.pdf/ https://doi.org/10.1017/aog.2017.23 |
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ftarcabc:oai:arcabc.ca:twu_430 2023-06-11T04:03:53+02:00 Modelling intra-annual dynamics of a major marine-terminating Arctic glacier Sam, Pimentel (author) Flowers, Gwenn E. (author) Sharp, Martin J. (author) Danielson, Bradley (author) Copland, Luke (author) Van Wychen, Wesley (author) Duncan, Angus (author) Kavanaugh, Jeffrey L. (author) NSERC (Funder) 2017 https://arcabc.ca/islandora/object/twu%3A430 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/9BA9EFDDF0BD74B9C848B2446094399D/S0260305517000234a.pdf/ https://doi.org/10.1017/aog.2017.23 unknown Annals of Glaciology Annals of Glaciology https://arcabc.ca/islandora/object/twu%3A430 twu:430 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/9BA9EFDDF0BD74B9C848B2446094399D/S0260305517000234a.pdf/ uuid: 524c34f5-e185-4a9a-b8cb-04c113964b2a doi:10.1017/aog.2017.23 author article Text 2017 ftarcabc https://doi.org/10.1017/aog.2017.23 2023-05-28T17:44:50Z Significant intra-annual variability in flow rates of tidewater-terminating Arctic glaciers has been observed in recent years. These changes may result from oceanic and/or atmospheric forcing through (1) perturbations at the terminus, such as enhanced submarine melt and changes in sea-ice buttressing, or (2) increased surface melt, in response to atmospheric warming, reaching the bed and promoting glacier slip. We examine the influence of these processes on Belcher Glacier, a large fast-flowing tidewater outlet of the Devon Island ice cap in the Canadian Arctic. A hydrologically-coupled higher-order ice flow model is used to estimate changes in glacier flow speed as a result of changes in sea-ice buttressing and hydrologically-driven melt-season dynamics. Daily run-off from five sub-catchments over the 2008 and 2009 melt seasons provides meltwater forcing for the model simulations. Model results are compared with remotely-sensed and in situ ice-surface velocity measurements. Sea-ice effects are found to have a minor influence on glacier flow speed relative to that of meltwater drainage, which is clearly implicated in short-term velocity variations during the melt season. We find that threshold drainage is essential in determining the timing of these short-lived accelerations. Peer reviewed Article in Journal/Newspaper Annals of Glaciology Arctic Devon Island Ice cap Sea ice Tidewater Arca (BC's Digital Treasures) Arctic Devon Island ENVELOPE(-88.000,-88.000,75.252,75.252) Belcher ENVELOPE(-94.172,-94.172,57.936,57.936) Belcher Glacier ENVELOPE(-81.354,-81.354,75.682,75.682) Annals of Glaciology 58 74 118 130 |
institution |
Open Polar |
collection |
Arca (BC's Digital Treasures) |
op_collection_id |
ftarcabc |
language |
unknown |
description |
Significant intra-annual variability in flow rates of tidewater-terminating Arctic glaciers has been observed in recent years. These changes may result from oceanic and/or atmospheric forcing through (1) perturbations at the terminus, such as enhanced submarine melt and changes in sea-ice buttressing, or (2) increased surface melt, in response to atmospheric warming, reaching the bed and promoting glacier slip. We examine the influence of these processes on Belcher Glacier, a large fast-flowing tidewater outlet of the Devon Island ice cap in the Canadian Arctic. A hydrologically-coupled higher-order ice flow model is used to estimate changes in glacier flow speed as a result of changes in sea-ice buttressing and hydrologically-driven melt-season dynamics. Daily run-off from five sub-catchments over the 2008 and 2009 melt seasons provides meltwater forcing for the model simulations. Model results are compared with remotely-sensed and in situ ice-surface velocity measurements. Sea-ice effects are found to have a minor influence on glacier flow speed relative to that of meltwater drainage, which is clearly implicated in short-term velocity variations during the melt season. We find that threshold drainage is essential in determining the timing of these short-lived accelerations. Peer reviewed |
author2 |
Sam, Pimentel (author) Flowers, Gwenn E. (author) Sharp, Martin J. (author) Danielson, Bradley (author) Copland, Luke (author) Van Wychen, Wesley (author) Duncan, Angus (author) Kavanaugh, Jeffrey L. (author) NSERC (Funder) |
format |
Article in Journal/Newspaper |
title |
Modelling intra-annual dynamics of a major marine-terminating Arctic glacier |
spellingShingle |
Modelling intra-annual dynamics of a major marine-terminating Arctic glacier |
title_short |
Modelling intra-annual dynamics of a major marine-terminating Arctic glacier |
title_full |
Modelling intra-annual dynamics of a major marine-terminating Arctic glacier |
title_fullStr |
Modelling intra-annual dynamics of a major marine-terminating Arctic glacier |
title_full_unstemmed |
Modelling intra-annual dynamics of a major marine-terminating Arctic glacier |
title_sort |
modelling intra-annual dynamics of a major marine-terminating arctic glacier |
publisher |
Annals of Glaciology |
publishDate |
2017 |
url |
https://arcabc.ca/islandora/object/twu%3A430 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/9BA9EFDDF0BD74B9C848B2446094399D/S0260305517000234a.pdf/ https://doi.org/10.1017/aog.2017.23 |
long_lat |
ENVELOPE(-88.000,-88.000,75.252,75.252) ENVELOPE(-94.172,-94.172,57.936,57.936) ENVELOPE(-81.354,-81.354,75.682,75.682) |
geographic |
Arctic Devon Island Belcher Belcher Glacier |
geographic_facet |
Arctic Devon Island Belcher Belcher Glacier |
genre |
Annals of Glaciology Arctic Devon Island Ice cap Sea ice Tidewater |
genre_facet |
Annals of Glaciology Arctic Devon Island Ice cap Sea ice Tidewater |
op_relation |
Annals of Glaciology https://arcabc.ca/islandora/object/twu%3A430 twu:430 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/9BA9EFDDF0BD74B9C848B2446094399D/S0260305517000234a.pdf/ uuid: 524c34f5-e185-4a9a-b8cb-04c113964b2a doi:10.1017/aog.2017.23 |
op_rights |
author |
op_doi |
https://doi.org/10.1017/aog.2017.23 |
container_title |
Annals of Glaciology |
container_volume |
58 |
container_issue |
74 |
container_start_page |
118 |
op_container_end_page |
130 |
_version_ |
1768384245908111360 |